Hi, at last got round to posting my question. On first start up i am getting a slight rough run, like a missfire if it was a petrol engine, then a large cloud of blue smoke. I am letting the preheat go out before starting and the motor turns over 4 to 5 times before starting. The smoke does not smell of oil or a water / antifreez. more like an semi burnt diesel smell. As i say this only happens on first statup, the vehicle runs as normal at all other times with no warning lights / messages Any ideas most welcome, thanks. Robert